What is the open-loop gain of the op-amp? Describe how the negative feedback affects the gain of the amplifier

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The open-loop gain of an op-amp is the gain of the amplifier when there is no feedback loop present. This gain is typically very high, often on the order of 10^5 or more.

Negative feedback reduces the overall gain of the amplifier by feeding back a portion of the output signal to the input. This helps to stabilize the amplifier and prevent it from saturating or oscillating. The amount of reduction in gain depends on the amount of feedback applied, as well as the frequency response of the amplifier and the feedback loop. In general, the more negative feedback that is applied, the lower the overall gain of the amplifier will be.